Water Treatment Operator 3 Exam 1 Questions
with Correct Answers
What does chlorine react to produce trihalomethanes?
A.) Synthetic organic chemicals
B.) Naturally occurring organic compounds
C.) Distribution system biofilms
D.) Volatile organic chemicals
B.) Naturally occurring organic compounds.
Ball check valves on chemical feed pumps are used to prevent liquid chemicals from?
A.) Evaporating
B.) Draining through feed lines and pump heads
C.) Clogging diaphragms
D.) Intermixing with incompatible chemicals
B.) Draining through feed lines and pump head
Raw water turbidity changed from 10 to 300 turbidity units during the previous shift
and the finished water turbidity increased from 0.1 to 1.0 turbidity unit. The unit
process that would best control this situation is
A.) Coagulation
B.) Disinfection
C.) Filtration
D.) Sedimentation
,A.) Coagulation
According to the Federal Safe Drinking Water Act, a public water system using surface
water and filtration must measure finished water turbidity.
A.) Every six hours
B.) Every eight-hour shift
C.) Every twenty-four hours
D.) Continuous
D.) Continuous
Which is the correct order of the filter materials in a multi-media or mixed media
gravity filter from the top to the bottom?
A.) Anthracite coal, garnet, silica sand
B.) Anthracite coal, silica sand, garnet
C.) Garnet, anthracite coal, silica sand
D.) Silica sand, anthracite coal, garnet
B.) Anthracite coal, silica sand, garnet
How do polymers used as filter aids work to improve filter performance?
A.) Strengthen bonds between particles and coat filter media to improve absorption
B.) Eliminate short-circulating of water down the walls of the filter
C.) Reduce head loss through the filter
D.) Raise the pH of the water making it less corrosive
A.) Strengthen bonds between particles and coat filter media to improve adsorption
, Which of the following treatment processes is replicated as part of the jar test
procedure?
A.) Flocculation
B.) Filtration
C.) Fluoridation
D.) Reverse Osmosis
A.) Flocculation
In order to meet initial lead and copper sampling regulation requirements, what are
Tier 1 sample sites for lead and copper samples?
A.) Single family structures containing lead pipes or copper pipes with lead solder
installed after 1982
B.) Lead service lines installed immediately prior to the clearwell
C.) Settled water prior to the addition of chlorine
D.) Single family structures containing lead pipes or copper pipes with lead solder
installed after 1992
A.) Single family structures containing lead pipes or copper pipes with lead solder installed
after 1982
Which of the following is an indirect method of testing for membrane integrity?
A.) Partice counting
B.) Air pressure testing
with Correct Answers
What does chlorine react to produce trihalomethanes?
A.) Synthetic organic chemicals
B.) Naturally occurring organic compounds
C.) Distribution system biofilms
D.) Volatile organic chemicals
B.) Naturally occurring organic compounds.
Ball check valves on chemical feed pumps are used to prevent liquid chemicals from?
A.) Evaporating
B.) Draining through feed lines and pump heads
C.) Clogging diaphragms
D.) Intermixing with incompatible chemicals
B.) Draining through feed lines and pump head
Raw water turbidity changed from 10 to 300 turbidity units during the previous shift
and the finished water turbidity increased from 0.1 to 1.0 turbidity unit. The unit
process that would best control this situation is
A.) Coagulation
B.) Disinfection
C.) Filtration
D.) Sedimentation
,A.) Coagulation
According to the Federal Safe Drinking Water Act, a public water system using surface
water and filtration must measure finished water turbidity.
A.) Every six hours
B.) Every eight-hour shift
C.) Every twenty-four hours
D.) Continuous
D.) Continuous
Which is the correct order of the filter materials in a multi-media or mixed media
gravity filter from the top to the bottom?
A.) Anthracite coal, garnet, silica sand
B.) Anthracite coal, silica sand, garnet
C.) Garnet, anthracite coal, silica sand
D.) Silica sand, anthracite coal, garnet
B.) Anthracite coal, silica sand, garnet
How do polymers used as filter aids work to improve filter performance?
A.) Strengthen bonds between particles and coat filter media to improve absorption
B.) Eliminate short-circulating of water down the walls of the filter
C.) Reduce head loss through the filter
D.) Raise the pH of the water making it less corrosive
A.) Strengthen bonds between particles and coat filter media to improve adsorption
, Which of the following treatment processes is replicated as part of the jar test
procedure?
A.) Flocculation
B.) Filtration
C.) Fluoridation
D.) Reverse Osmosis
A.) Flocculation
In order to meet initial lead and copper sampling regulation requirements, what are
Tier 1 sample sites for lead and copper samples?
A.) Single family structures containing lead pipes or copper pipes with lead solder
installed after 1982
B.) Lead service lines installed immediately prior to the clearwell
C.) Settled water prior to the addition of chlorine
D.) Single family structures containing lead pipes or copper pipes with lead solder
installed after 1992
A.) Single family structures containing lead pipes or copper pipes with lead solder installed
after 1982
Which of the following is an indirect method of testing for membrane integrity?
A.) Partice counting
B.) Air pressure testing
